WATER TECHNOLOGIES

KALDNES MBBRAn overview of the technology

TM

The Kaldnes™ MBBR technology is our implementationof the biofilm principle. This technology is our point of departure for many of the unique processes we have developed.

More than plasticsJust to add some plastics, moulded into a peculiar shape, to a wastewater basin and see what you get is a safe way to failure.Besides the carriers you need knowledge of microbiology, hydraulicsand engineering to design a long-term solution.

Our carriers are of course a vital ingredient in the Kaldnes™ MBBR technology. On their protected surfaces different microorganismsranging from bacteria to ciliates and rotifers are established in a biofilm. These carriers are kept in motion either by the blast air injection in aerobic systems or by stirrers in anoxic or anaerobic systems. Thanks to this motion, the impurities in the water are transported to the biofilm and thus reduced.

In a suspended sludge based treatment system, the sludge has to continuously be separated from the treated water and returned to the treatment basin. In an Kaldnes™ MBBR, the carriers and the active biofilm are detained in the treatment tank by sieves over the outlet, which allow the treated water to pass to downstream units for further processing. It is very important to design the sieves properly not just for the retention of the carriers but also to avoid hydraulic issues. There are several benefits to a suspended biofilm system. Among them are increased durabilitytowards toxicity and variable loading, simple operation and a treatment system insensitive of bulking sludge.

There is a continuous research and development of the Kaldnes™ MBBR technology. Existing processes are improved and processes for new applications are invented. A broad range of different carriers types has been developed in order to target the specific needs of different solutions. The high number of installations spread all over the world shows that many have discovered the benefits of a biofilm process based on Kaldnes™ MBBR technology.

Flexible solutionOur processes based on the Kaldnes™ MBBR technology is feasible for both industrial and municipalwastewater and are used for: • organic removal • nitrification • denitrification • detoxificationThe flexibility of our MBBR processes makes them an ideal solution for new plants or upgrade and expansion of older ones.

Features

• Compact• Robust• Simple operation• Easy upgrade• Enhances nitrification• Low maintenance• Patented technologies• R&D driven

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Wastewater treatment with microorganismsThe Kaldnes™ MBBR technology is the core of our solutions. The microorganisms treating the wastewater growon the surfaces of a carrier in the treatment reactor. The flexibility of our patented technology allows the designof very compact and efficient stand-alone MBBR solutions as well as optimal upgrades of other, existing,biological processes, often without the need for new basins. The Kaldnes™ MBBR technology is patented byKrüger Kaldnes.

Kaldnes™ stand alone MBBR solutionsKaldnes™ pure MBBR systems are compact, simpleto operate and very efficient for removal of BOD, ammonia and nitrogen. Today, solutions such as the Kaldnes™ process (municipal waste water treatment) and the Natrix™ process (pulp and paper applications) are used in hundreds of installations around the world.

Hybas™ combination processHybas™ combination process is utilizing both suspendedand attached growth within one and the same reactor. Fastbiological processes, such as BOD removal and denitrification,are typically carried out by the suspended phase, while slowmicrobial transformations, such as nitrification, take place mainlyin the biofilm. Hybas™ biological process is a superior IFAS (Integrated Fixed-film Activated Sludge) from Anox-Kaldnes and can be used as a very efficient upgrade of activated sludge plants for enhanced nitrification ortotal nitrogen removal within existing volumes. Enhanced biological phosphorous removal (EBPR) can also beincluded.

LagoonGuard™ biological processThe LagoonGuard™ biological process entails a well designed supplementary biofilm solution after the lagoon, which will handle the ammonium and provide some additional COD removal. The upgrade is easy, economical, compact and requires a minimum level of maintenance.

BAS™ combination processThe BAS™ combination process consists of one or more Kaldnes™ MBBR, followed by anactivated sludge system. The high rate biofilm stage is designed to pre-treat the wastewater to remove the readily bio-degradable organic matter prior to the activated sludge system. Advantages are dramatically increased capacity, improved process stability and sludge separability. Conversion to a BAS™ process is an ideal way of upgrading existing activated sludge plants for higher capacity of organic removal and better performance. Furthermore, properly operated, a BAS™ process will produce dramatically less excess biosludge than a conventional activated sludge process.

Krüger Kaldnes

Hegnasletta 11 • NO-3217 Sandefjord, Norwayoff. +47 91 60 80 00 • Fax: +47 33 48 50 01 • postnorway@krugerkaldnes.no

www.krugerkaldnes.no www.veoliawatertechnologies.com

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